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{
"metadata": {
"name": "",
"signature": "sha256:2235c937260175b0ab97c5358d9d0f83ecc788771c1f725849b19d038912d334"
},
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter01:Fundamental of Energy - Science and Technology"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex1.1:pg-36"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Given data:\n",
"T1=500+273.0 #source temp in kelvin \n",
"T2=100+273.0 #sink temperature in kelvin\n",
"W=1 # output power in kW\n",
"\n",
"nth=1-(T2/T1) # thermal efficiency\n",
"\n",
"Q1=1/nth # heat supplied in kW\n",
"\n",
"Q2=Q1-W # heat rejected in kW\n",
"\n",
"print \" The heat rejected is \",Q2,\"kW\"\n",
"\n",
"# the answer in book is wrong due to incorrect value of T1 "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" The heat rejected is 0.9325 kW\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex1.2:pg-37"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Given data:\n",
"T1=40+273.0 # ambient temp in kelvin\n",
"T2=-10+273.0 # freezer temp in kelvin\n",
"Q2=2 # heat loss rate for freezer in kJ/s\n",
"\n",
"Q1=T1*(Q2/T2) # heat transfer rate in kJ/s\n",
"\n",
"W=Q1-Q2 # work in kW\n",
"\n",
"print \"The least power required is \",round(W,2),\"kW\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The least power required is 0.38 kW\n"
]
}
],
"prompt_number": 14
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex1.3:pg-37"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Given data:\n",
"Q1=3e4 # heat required in kJ/h\n",
"W=2e3 # work required in kJ/h\n",
"\n",
"Q2=Q1-W # heat abstracted from outside in kJ/h\n",
"\n",
"COP=Q1/(Q1-Q2) # COP of heat pump\n",
"\n",
"print \"Heat abstracted from outside air is \",Q2,\"kJ/h\"\n",
"print \"COP heat pump is \",COP\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Heat abstracted from outside air is 28000.0 kJ/h\n",
"COP het pump is 15.0\n"
]
}
],
"prompt_number": 16
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex1.4:pg-38"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Given data:\n",
"T11=320+273.0 # temp at source 1 in kelvin\n",
"Q1=10000.0 # heat transfer rate at source 1 in kJ/min\n",
"T12=65+273.0 # temp at source 2 in kelvin\n",
"Q2=120000.0 # heat transfer rate at source 2 in kJ/min\n",
"T2=35+273.0 # temp of surrounding in kelvin\n",
"\n",
"n1=1-(T2/T11) # efficiency by source 1\n",
"n2=1-(T2/T12) # efficiency by source 2\n",
"\n",
"W1=Q1*n1 # work at source 1 in kJ/min\n",
"W2=Q2*n2 # work at source 2 in kJ/min\n",
"\n",
"print \"The work done at two sources is W1=\",W1,\" kJ/min W2=\",W2,\"kJ/min\"\n",
"print \"The larger power is provided by source 2\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The work done at two sources is W1= 4806.07082631 kJ/min W2= 10650.887574 kJ/min\n",
"The larger power is provided by source 2\n"
]
}
],
"prompt_number": 17
}
],
"metadata": {}
}
]
}
|
